Why Sugar Is Added to Food: Food Science 101
Kara R. Goldfein and Joanne L. Slavin
Abstract: Avoiding too much sugar is an accepted dietary guidance throughout the world. The U.S. Nutrition Facts
panel includes information on total sugars in foods. A focus on added sugars is linked to the concept of discretionary
calories and decreasing consumption of added sugars or free sugars as a means to assist a consumer to identify foods that
are nutrient-dense. On March 14, 2014, the U.S. Food and Drug Administration proposed that including “added sugars”
declaration on the Nutrition Facts panel would be another tool to help consumers reduce excessive discretionary calorie
intake from added sugars. Through deductive reasoning, labeling added sugars is one tactic to potentially curb the obesity
epidemic in the United States. This review discusses the functions of sugar in food and shows that the methods used to
replace added sugars in foods can result in no reduction in calorie content or improvement in nutrient density. Without
clear benefit to the consumer for added sugars labeling, this review highlights the complex business obstacles, costs, and
consumer confusion resulting from the proposed rule.
Keywords: food labeling, nutrition facts, public health, sucrose, sugars
Introduction
The obesity epidemic in the United States has been a key public health issue due to the high rate of obesity and the increased
healthcare cost associated with it. More than one-third (34.9%
or 78.6 million) of adults and 17% of youth are obese in the
United States (Ogden and others 2014) and, in 2008, the estimated annual medical cost of obesity was $147 billion (Finkelstein
and others 2009). According to the 2010 Dietary Guidelines for
Americans, poor diet and lack of physical activity are the most important factors contributing to this epidemic (U.S. Department of
Agriculture [USDA] and U.S. Department of Health and Human
Services [HHS] 2010). These factors are the basis for the 2 overarching concepts of the 2010 Dietary Guidelines for Americans:
maintain calorie balance over time to achieve and sustain a normal healthy weight and focus on consuming nutrient-dense foods
and beverages (USDA and HHS 2010). Added sugars can violate
both of these overarching concepts by resulting in extra calories
being consumed and replacing nutrient-dense foods and beverages, and this is why the 2010 Dietary Guidelines for Americans
recommend limiting the intake of added sugars in the American
diet. This same principle of displacing nutrient-dense foods was
recently highlighted in the Scientific Report of the 2015 Dietary
Guidelines Advisory Committee, but the committee took it a
step further by stating that the overconsumption of added sugars
has been linked with negative health outcomes, such as increased
body weight, type II diabetes, and cardiovascular disease (USDA
and HHS 2015).
On March 3, 2014, the U.S. Food and Drug Administration
(FDA) released its proposal for the nutrition and supplement facts
labels. Given the recent public attention on added sugars, it was
not a surprise to see that “added sugars” is one of the suggested
changes. FDA is proposing the mandatory declaration of added
sugars on the nutrition facts label to assist consumers in maintaining health-beneficial dietary practices (FDA 2014b). However,
there is no clear correlation that the labeling of added sugars will
benefit the consumer, and the challenges of labeling added sugars
will fall onto the food industry.
The objectives of this article are to review (1) the relationship
of carbohydrates, sugars, added sugars, and sweeteners; (2) the
purpose of sugar in food products; (3) the challenges of labeling
added sugars; (4) the issues with current food technology to
replace added sugars in products; and (5) a discussion on whether
labeling added sugars is an appropriate public health strategy to
address the obesity epidemic.
Carbohydrates, Sugars, Added Sugars, and Sweeteners
Sugars and carbohydrates
The most commonly understood added sugar is sucrose or table
sugar. Sucrose is a simple carbohydrate and occurs naturally in
plants because they make sucrose via photosynthesis (Kitts 2010).
The highest concentrations of sucrose are found in sugar cane and
sugar beets, which are the main sources for making commercial
sugar (Kitts 2010).
Sucrose is one of many different types of carbohydrates that
are widely distributed in nature. Structurally, carbohydrates are
molecules of carbon, hydrogen, and oxygen, and there are 3 major classifications of carbohydrates: monosaccharides, oligosaccharides, and polysaccharides (Varzakas and others 2012). The term
saccharide is a synonym for carbohydrate.
MS 20150834 Submitted 18/5/2015, Accepted 22/6/2015. Authors are with
As the name implies, a monosaccharide consists of a single
Dept. of Food Science and Nutrition, Univ. of Minnesota, 1334 Eckles Ave., St. Paul,
molecular
unit and is the fundamental unit of almost all carboMN, 55108, U.S.A. Direct inquiries to author Slavin (E-mail: [email protected]).
hydrates. Common monosaccharides found in nature include
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Challenges of labeling added sugars . . .
glucose (dextrose), galactose, mannose, and fructose. Honey and
fruit juices are common food sources of free glucose and fructose.
Oligosaccharides consist of more than one monosaccharide usually, 2 to 10 monosaccharides. Disaccharides are the most common
type of oligosaccharides found in food. Sucrose is officially classified as a disaccharide, and it is composed of one molecule of
glucose and fructose and occurs naturally in fruits and vegetables.
Lactose is composed of galactose and glucose and occurs naturally only in milk. Maltose is composed of 2 glucoses, and it is
a byproduct of the enzymatic degradation of starch by amylase.
With a similar chemical structure as maltose, trehalose also contains 2 glucose molecules, which are linked by an α1,1-glyosidic
bond versus an α1,4-glyosidic bond in maltose (Wilson 2007). It
is widely distributed in nature, and mushrooms can contain up to
10% to 25% of trehalose by dry weight (Varzakas and others 2012).
Polysaccharides are composed of a large number of monosaccharides, and the most common ones in nature are starch (energy
storage for plants), glycogen (energy storage in animals, including
humans), and cellulose (supporting material and structural component in plants). Dietary fiber is another common polysaccharide
discussed in the human diet.
Monosaccharides and disaccharides are also known as sugars,
simple carbohydrates, or simple sugars. Sugars occur naturally in
food or can be added during the processing of foods. Naturally
occurring sugars in food can also be termed intrinsic or inherent
sugars. Natural sources of sugars include vegetables, fruits, milk,
and honey (Figure 1). The most common sugar added to food is
sucrose, also called table sugar
The role and metabolism of carbohydrates
Carbohydrates are an integral part of a “healthy” diet. Once
consumed, carbohydrates are digested and broken down into glucose. Carbohydrates (starch and sugar) are the primary source of
energy for the human body providing on average 4 calories per
gram, and glucose is essential for the central nervous system to
function (Slavin and Carlson 2014). Because of this, the Inst. of
Medicine (IOM) set an RDA for carbohydrates of 130 g/d for
adults and children aged ࣙ1-year-old and an acceptable macronutrient distribution range for carbohydrates at 45% to 65% of total
calories (IOM 2005).
Because all sugars are carbohydrates, the body metabolizes them
similarly by breaking them down into glucose to be used for energy
(USDA and HHS 2010). Regardless, if the sugars are naturally occurring or added during food processing, the molecular structure
and nutritional value are the same, providing 4 calories per gram.
In other words, the human body does not distinguish between
added sugars and naturally occurring sugars in foods, so whether a
person consumes 10 g of added sugars or 10 g of inherent sugars,
it makes no difference to the body (Hess and others 2012).
but very little or no calories, or glycemic response in the body,
when they are metabolized, unlike carbohydrates (Varzakas and
others 2012). Some nonnutritive sweeteners are not metabolized
and are excreted unchanged by the body (Varzakas and others
2012). Other nonnutritive sweeteners can be partially metabolized, to a limited degree, and their metabolites are readily excreted
(Varzakas and others 2012; Carakostas and others 2012). Nonnutritive sweeteners can be derived from plant sources, such as monk
fruit or stevioside, or synthetically made, such as acesulfame K, aspartame, sucralose, or saccharine. Synthetically made nonnutritive
sweeteners are also known as artificial sweeteners.
Sugar alcohols
Sugar alcohols could be placed in the nutritive sweetener group
because they technically provide calories and taste similar to sucrose. However, they deserve their own discussion because of their
reduced caloric value ranging from 0.2 to 3 kcal/g (Varzakas and
others 2012). Unlike nutritive sweeteners, their digestion requires
little or no insulin synthesis, and they are noncariogenic. When
consumed in excessive, some of the sugar alcohols such as mannitol
and sorbitol can have a laxative effect unlike nutritive sweeteners.
Sugar alcohols are derivatives of monosaccharides, disaccharides,
and other oligosaccharides, and they can occur naturally in many
fruits and vegetables (Varzakas and others 2012). Because they can
contribute to sweetness with fewer calories, they are commonly
used as bulk sweeteners in some food products. Other products that
use sugar alcohols include mouthwash, toothpaste, breath mints,
chewing gum, and special foods for diabetics.
FDA definition of added sugars
In FDA’s proposal, the term “added sugars” is defined as “sugars that are either added during the processing of food, or are
packaged as such, and include sugars (free monosaccharides and
disaccharides), syrups, naturally occurring sugars that are isolated
from a whole food and concentrated so that sugar is the primary
component (such as fruit juice concentrates), and other caloric
sweeteners” (FDA 2014b). In other words, FDA is proposing that
nutritive sweeteners that are added during the processing of food
are considered added sugars. Names for added sugars in the proposal included brown sugar, corn sweetener, corn syrup, dextrose, fructose, fruit juice concentrates, glucose, high-fructose corn
syrup, honey, invert sugar, lactose, maltose, malt sugar, molasses,
raw sugar, turbinado sugar, trehalose, and sucrose. FDA further
specified that sugar alcohols are not considered added sugars.
Functional Properties of Sugar
Sugar (sucrose) has several functional properties in food and,
so far, no other sweetener has been found or developed to duplicate all or even many of them. These functional properties are
derived from the sensory and physical properties of sugar and its
many reactions and interactions with the other food ingredients
Sweeteners
present (Spillane 2006). Understanding the function of sugar in a
A sweetener is any naturally occurring or synthetically made food product is an important point to consider when reducing or
substance that provides a sweet taste in food and beverages. Su- removing sugar from the product.
crose (table sugar) is regarded as the “gold” standard for sweet taste
and is the most common sweetener in the food industry (Varzakas Sweetness, flavor enhancement, and flavor balance
The most notable function of sugar in food is its sweet taste.
and others 2012). Sweeteners can generally be classified as nutritive or nonnutritive. Nutritive or caloric sweeteners are usually Sweet taste serves as a sensory cue for energy as well as a source of
made by fruits, sugar cane, and sugar beets and on average provide pleasure. Sweetness is one of a few tastes which are innate, and it
4 calories per gram (Varzakas and others 2012). Common nutri- has been argued that a preference for sweet taste evolved to ensure
tive sweeteners include sucrose, the other simple carbohydrates, that animals and humans chose foods that are high in calories and
liquid sugars, honey, syrups, and fruit juice concentrates. Non- nontoxic (Spillane 2006). During infancy, the heightened prefernutritive or high-intensity sweeteners provide sweetness to food ence for sweet tastes may have ensured the acceptance of nature’s
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Figure 1–Naturally occurring sugar in foods per 100 g (USDA Natl. Nutrient Database for Standard Reference 2014).
first food—mothers’ milk. Human breastmilk naturally contains
2.12 g of sugar per 1 fluid ounce (USDA 2014). Therefore, these
taste mechanisms apparently had a significant effect on survival.
Sweetness improves the palatability of food. Thus, adding sugar
to foods with high nutrient quality may increase the chance that
they are consumed. Chocolate milk is an example of increasing
the palatability of milk for kids, which provides important nutrients particularly calcium, potassium, and vitamin D (Slavin 2014).
Sweetness from sugar can also improve the palatability of foods for
the elderly by compensating for the chemosensory losses that the
elderly experience (Spillane 2006).
In food products, sugar plays an important and unique role
in contributing to the flavor profile by interacting with other
ingredients to enhance or lessen certain flavors. The addition of
sugar enhances flavors by increasing the aroma of the flavor. A
flavor aroma possesses no taste properties, but once combined
with sugar, the sweetness of sugar and the flavor aroma work
synergistically (Spillane 2006). For example, if a peach aroma is
added to a solution with no sugar, the solution would have no taste,
but with sugar added in the solution, sweetness and the peach flavor
can be perceived. Small amounts of sugar can be added to cooked
vegetables and meat to enhance the food’s natural flavors without
making them taste sweet (Kitts 2010). The addition of sugar also
balances the sweetness and acidity in fruit-based products such as
beverages, sauces, and preserves (Gwinn 2013). In reduced-fat ice
cream, sugar is added to balance out flavor (Varzakas and others
2012), and the sweetness of sugar balances the bitterness of cocoa
in chocolate (Spillane 2006).
Color and flavor formation
The Maillard browning reaction and caramelization are
fundamental to the formation of color and flavor in several food
products. Caramelization occurs when sugars are heated above
their melting point in the absence of proteins causing the sugars to
degrade (Varzakas and others 2012). This produces a dark brown
color and imparts caramel taste and aroma in food products.
Caramelization is used in a wide range of products including
sauces, candies, desserts, breads, jams, and dessert wine (Kroh
1994). This reaction can also be used to commercially produce
caramel colors and flavors (Kitts 2010).
The Maillard reaction is another form of nonenzymatic browning, which is the result of a reaction between an amino acid
and sugar (Hwang and others 2011). This is a complex reaction
that depends on several factors: reactant types and concentrations,
temperature, reaction time, pH, and water activity (Hwang and
others 2011). Besides color formation in food, the Maillard reaction provides desirable flavor formation in several food products,
such as baked goods, chocolate, coffee, and meat (Danehy and
Wolnak 1983). In bread-baking, the early stages of the Maillard reaction are responsible for the pleasant aroma whereas the late-stage
reactions produce the recognizable brown crust (Kitts 2010).
Bulk and texture
Because sugar can be used as one of the primary ingredients in
products, it affects the physical characteristics of food to a significant degree. Sugar provides bulk which impacts the mouthfeel
and texture of many food products. Instead of being used for their
sweetening properties, sometimes specific sugars are used as bulking agents or carriers for other ingredients, especially the sugars
that are less sweet than sucrose (Spillane 2006). Sucrose is given an
arbitrary sweetness level of 1 to allow its comparison with other
sweeteners, and there is a 4 to 5-fold change in relative sweetness
between the various sugars (Table 1).
Sugar plays an important role in the texture of bakery products.
It tenderizes bakery products by competing with starch molecules
and proteins for liquid components in the dough, which
prevents overdevelopment of gluten and slows down gelanization
(Varzakas and others 2012). During the mixing of dough, sugar
promotes lightness by incorporating air in the form of small air
cells into the shortening, and these air cells will expand due to
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Table 1–Relative sweetness of various sugars.
Sugar
Sucrose
Fructose
Glucose
Maltose
Galactose
Lactose
Mannose
Trehalose
Relative sweetness
Reference
1
1.7
0.75
0.30
0.30
0.15
0.60
0.45
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Tamime and Robinson 1999
Wilson 2007
the gases generated by the leavening agents (Varzakas and others
2012). For cookies, sugar influences the spread of dough and
surface cracking (Pareyt and Delcour 2008). In foam-type cakes,
sugar interacts with egg proteins to stabilize the whipped foam
structure making it more elastic, so that the air cells can expand
(Varzakas and others 2012).
The level of sugar can affect the ice and crystal crystallization size
in the manufacturing of ice cream and other frozen desserts. The
sugar’s ability to attract and hold water diminishes the water available for crystallization during freezing and, as a result, the freezing
point for these frozen desserts drops, thus allowing colder temperatures to be used during processing (Varzakas and others 2012).
This combination of lower freezing point and colder temperatures
during processing produces a frozen product with extremely small
ice crystals, and these tiny ice crystals give frozen desserts their
desirable smooth, creamy texture.
Sugar crystallization is a major determinant of the texture for
candies. It is minimized to create the soft texture of taffy candies
and fudge and, on the contrary, it is maximized to create the desirable grainy texture of hard candies (Kitts 2010). Besides impacting
the freezing point in frozen desserts, a higher concentration of
sugar increases the boiling point of solutions used to make candies (Kitts 2010). This allows more sugar to be dissolved, which
optimizes the final consistency of the candy.
In beverages, the high solubility of sugar contributes to the
mouthfeel of the product by giving the product body (Gwinn
2013). Sugar is also essential in the gelation of jams, preserves,
and jellies. Pectin, a natural component of fruits, has the ability to
form this gel, but only in the presence of sugar and acid (Varzakas
and others 2012).
Yeast fermentation is another type of food fermentation. It is
used in the production of yeast-leavened bakery products. Yeast
can utilize starch as a food source but prefers simple sugars, such as
glucose or sucrose, in the dough (Poitrenaud 2004). The fermentation of the carbohydrates produces gas causing the product to
rise. This, in turn, affects the volume, crumb texture, and softness
of the final product (Varzakas and others 2012).
Preservation
The hygroscopic nature of sugar plays a crucial role in reducing
water activity in foods (Kitts 2010). Hygroscopic is defined as the
ability to absorb water from the surrounding environment, which
helps in preserving and extending the shelf-life of food products
(Kitts 2010).In other words, the water in a food item is controlled
so that it is unavailable for chemical or biochemical reactions. Sugar
prevents spoilage of jams, jellies, and preserves after the jar has
been opened. Its ability to attract water dehydrates microorganisms
(yeast and bacteria), so they cannot multiply and thereby spoil the
food (Varzakas and others 2012). Sugar also acts as a humectant
in baked goods, which prevents drying out and staleness, thus
extending the shelf-life of these products (Spillane 2006).
Sugar also preserves the color of frozen fruits and jellies. In the
freezing of fruit, sugar prevents enzymatic browning discoloration
of the fruit by protecting the surfaces of the fruit from contact
with air (Varzakas and others 2012). For preserves and jellies,
sugar inhibits the fruit from absorbing water, so that the color of
the fruit will not fade (Varzakas and others 2012).
Pharmaceuticals
In addition to sweetening food, the sweetness of sugar can help
the palatability of medicine to ensure patient compliance (Spillane
2006). Sugar also provides other desirable functional properties in
pharmaceuticals due to its low toxicity, high purity, and diverse
physicochemical properties. It can act as an excipient by which
the active ingredient of medication is introduced to the body
(Spillane 2006). The correct formulation of the excipient (sugar)
and the active ingredients in the medication can provide accurate
delivery of the required dose and control the release of the active
ingredients to the targeted site of the body (Spillane 2006). In glucose tablets, dextrose (d-glucose) is the primary ingredient, and
they are used by diabetics to quickly raise their blood sugar levels in
the event of uncomfortable or disabling hypoglycemia. Given the
desirable functional properties of sugar, there will always be opporFermentation
Fermentation is a process in which microorganisms in the ab- tunities for sugar-based products in the pharmaceutical industry.
sence of oxygen generate energy by oxidizing carbohydrates. In
other words, carbohydrates including sugars are the food sources Challenges of Labeling Added Sugars
for these microorganisms. Fermentation has a long history of being Added sugars cannot be differentiated from total sugars
used in food production. Common food and beverages produced chemically and analytically
from fermentation include yogurt, vinegar, sour cream, wine, beer,
There are no chemical differences between added sugars and
bread, cheese, soy sauce, and sauerkraut.
naturally occurring sugars in food. Added sugars and inherent
Lactic acid bacteria fermentations are among the most ancient sugars are both simple carbohydrates composed of molecules of
and important fermentations in the world (Steinkraus 2004). This carbon, hydrogen, and oxygen. FDA’s overall approach is to rely
type of fermentation was significant for increasing the shelf-life on chemical definitions of nutrients as the basis for regulatory
of milk and preventing pathogens from growing in it. Today, it definitions for food labeling. This was noted in FDA’s proposal
is well known for its application in fermenting dairy products. for the inclusion of stearic acid in the definition of saturated fat
Lactic acid bacteria utilize the sugar lactose in the milk as a food (2014b). FDA had received comments to exclude stearic acid from
source and produces lactic acid and other organic molecules. These the definition of saturated fat because there is evidence indicating
metabolic products contribute significantly to flavor development that stearic acid does not raise LDL-cholesterol levels or the risk of
and the final aroma and taste of fermented dairy products such as cardiovascular heart disease unlike saturated fat (2014b). However,
sour cream, yogurt, and cheeses. The bacteria can also produce FDA responded that “the definitions of nutrients for food labeling
compounds that contribute to the viscosity, body, and mouthfeel purposes have traditionally been based on chemical definitions,
of the product (Gürakn and Altay 2010).
rather than individual physiological effects” (2014b). Thus, “added
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Challenges of labeling added sugars . . .
sugars” will be a unique nutrient on the proposed food label
because it will be not be chemically or physiologically different
than the nutrient “sugars” listed on the current food label.
Because there are no chemical differences, current analytical methods cannot distinguish between added sugars and naturally occurring sugars in food. In food analysis, chromatographic
methods can be used for qualitative analysis (identification) and
quantitative analysis (amount) of sugars in food products. High
performance liquid chromatography (HPLC) is the method of
choice for the analysis of simple carbohydrates (mono- and disaccharides) (BeMiller 2003). Gas chromatography is another method
that can be used, but in recent decades, it has been replaced by
HPLC (BeMiller 2003). Neither of these analytical methods can
distinguish whether the sugar was added to or naturally occurring
in a food. Once again, “added sugars” will be unique in the fact
that it will be the only nutrient on the proposed label not capable
of analytical determination.
The lack of an analytical method will present challenges to
determine compliance of added sugars values on the label under
FDA 21 C.F.R. § 101.9 (2014a). Current FDA regulations state
nutrition labeling compliance will be determined by “a composite
of 12 subsamples that shall be analyzed by appropriate methods as
given in the Official Methods of Analysis of the AOAC Intl. . . . if
no AOAC method is available or appropriate, by other reliable and
appropriate analytical procedures” (21 C.F.R. § 101.9 2014a). FDA
acknowledges the fact in the proposal that they will not be able to
rely on an analytical method to determine compliance with the
declaration of added sugars in foods that contain both added sugars
and naturally occurring sugars. As a result, FDA is proposing to
require manufacturers to create and keep certain records necessary
to verify the amount of added sugars present in a food that could be
requested for review by the FDA (2014b). Overall, straying away
from an analytical-based method to differentiate nutrients on the
Nutrition Facts label will lead to challenges for implementation
across the food industry and potentially inaccurate declaration of
added sugars values.
No universal definition for added sugars
There is no universal definition for added sugars. Table 2 summarizes the various definitions of added sugars across organizations. Compounded by the fact there is no analytical method to
determine the amount of added sugars, multiple definitions for
added sugars can result in inconsistencies and misinterpretations
by consumers, scientists, food manufacturers, ingredient suppliers,
and regulators alike. This would be true for any nutrient not just
for added sugars.
For example, FDA uses the term “added sugars” whereas the
World Health Organization (WHO) uses the term “free sugars”
(WHO 2015). WHO definition of “free sugars” includes fruit
juices whereas the FDA definition of “added sugars” is limited to
fruit juice concentrate (WHO 2015). This could create a challenge for food manufacturers that use international suppliers. An
international supplier may mistake that “free sugars” and “added
sugars” are identical and count any fruit juice in the formulation as
added sugars, which would result in overdeclaring the amount of
added sugars on the ingredient’s nutrition information as proposed
by the FDA regulations.
this claim and the proposed definition of added sugars are similar.
However, there are some inconsistencies that can be emphasized
with current food products making this claim, such as juices or
other beverages.
According to the current regulations, foods bearing the “no
added sugar” claim in food labeling must not contain an ingredient that is added during processing or packaging that is “sugar,”
as defined in FDA 21 C.F.R. §101.9 (2014a), or is an ingredient
that contains sugars that functionally substitutes for added sugars.
Sugars are defined in FDA 21 C.F.R. §101.9 (2014a) to mean “the
sum of all free mono- and disaccharides (such as glucose, fructose,
lactose, and sucrose), and examples of any other ingredient containing added sugars include jam, jelly, or concentrated fruit juice.
FDA further clarified in the 1993 preamble to the final ruling that
the mere presence in a food of an ingredient containing intrinsic
sugars, such as fruit juice or concentrated juice, would not disqualify a food from bearing a “no added sugar” claim as long as
the ingredient was not added to functionally substitute for added
sugars (FDA 1993). For instance, the addition of a concentrate of
the same juice, to achieve uniformity, or the addition of water to
a juice concentrate, to produce a single strength juice, would not
preclude the use of a “no sugar added” claim (FDA 1993).
Fruit juice concentrates are often preferred by food manufacturers for several reasons including sustainability, sourcing, and
logistics. Essentially, it is a lower-cost ingredient than fruit juice,
because removing the water from fruit significantly reduces the
volume and weight of the product that must be shipped. Thus, a
food manufacturer may purchase fruit juice concentrate and partially or fully reconstitute it back to single strength fruit juice as a
step in the manufacturing of the finished product.
In FDA’s proposal, fruit juice concentrates are considered added
sugars whereas single strength fruit juice is not. This presents the
important question whether a fruit juice concentrate that has been
fully reconstituted back to juice would be considered added sugars
under the proposal.
For example, a manufacturer is making a 100% apple juice
product with apple juice concentrate and water. The ingredient
apple juice concentrate contains approximately 39% sugar, and in
order to make a 100% apple juice product with the minimum
Brix level of 11.5 per FDA 21 C.F.R. § 101.31 (2014a), at least
29.5% of the apple juice concentrate is needed in the finished
product formula. Because water is the only other ingredient used
in the formula, all the sugar in the finished product is coming from
the apple juice concentrate, and on an 8 fluid ounce serving size,
the total sugars label at a rounded value of 29 g. Because the
apple juice concentrate has been fully reconstituted back to single
strength, the product qualifies for the current “no added sugar
claim,” but it could nonetheless be required to declare 29 g of
added sugars on the label under the proposed rule because a fruit
juice concentrate has been added during the processing of the
finished product.
Thus, this example illustrates that it is imperative that the proposed definition of added sugars be consistent with the current “no
added sugar” claim definition. Overall, the individual consuming
the food with fruit juice or reconstituted fruit juice concentrate
will be consuming the same amount of sugar from the same source,
fruit (GMA 2014).
No added sugar claim and reconstituted fruit juice Functionality of added sugars
As discussed in the previous section, sugars are added to food
concentrates
Current FDA regulations do allow for a “no added sugar” claim for various reasons in addition to providing sweetness. Thereunder 21 FDA C.F.R. § 101.60 (2014a). Overall, the criteria for fore, this poses the question on whether sugars added to food for
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Challenges of labeling added sugars . . .
Table 2–Various added sugar definitions.
Organization
FDA 2014b
IOM 2005
WHO 2015
AHA 2014
DGA 2010 (USDA and HHS 2010)
DGAC Technical Report 2015 (USDA
and HHS 2015)
Definition
Exceptions
Sugars that are either added during the processing of food, or are
packaged as such, and include sugars (free monosaccharides and
disaccharides), syrups, naturally occurring sugars that are isolated
from a whole food and concentrated so that sugar is the primary
component (fruit juice concentrates), and other caloric
sweeteners.
Sugars and syrups that are added to foods during processing or
preparation. Specifically, added sugars include white sugar,
brown sugar, raw sugar, corn syrup, corn-syrup solids,
high-fructose corn syrup, malt syrup, maple syrup, pancake syrup,
fructose sweetener, liquid fructose, honey, molasses, anhydrous
dextrose, and crystal dextrose.
Free sugars refer to mono- and disaccharides added to foods and
beverages by the manufacturer, cook or consumer, and sugars
naturally present in honey, syrups, fruit juices, and fruit juice
concentrates.
Added sugars include any sugars or caloric sweeteners that
are added to foods or beverages during processing or preparation.
Added sugars (or added sweeteners) can include natural sugars
such as white sugar, brown sugar and honey as well as other
caloric sweeteners that are chemically manufactured (such as
high-fructose corn syrup).
Caloric sweeteners that are added to foods during processing,
preparation, or consumed separately.
Used the same definition proposed by FDA (2014b).
Sugar alcohols and naturally
occurring sugars such as lactose in
milk or fructose in fruits
other reasons than sweetening should be considered added sugars.
Under FDA 21 C.F.R. § 101.60 (2014a), one could argue it would
be inappropriate to include sugars that are added to food for purposes other than sweetening as “added sugars” (GMA 2014). For
example, some natural flavor preparations may analyze for a trace
amount of sugars but their intended purpose is not to function
as a sweetener but as a flavor enhancer. On the contrary, one
could argue any substance with calories that can contribute to the
sweetness of a product could be considered a “caloric sweetener”
(General Mills 2014).
For yeast-leavened bread, the yeast prefers mono- or disaccharides (simple carbohydrates) over starch during fermentation
(Poitrenaud 2004). Additional sugar is added during bread fermentation because the composition of flour is insufficient in monoor disaccharides. If no sugar is added, then maltose from the starch
must be degraded once the naturally present simple sugars in flour
are exhausted. Not all yeast types can break down maltose without
a lag adjustment, which results in a depression of gas production
during the fermentation process (Poitrenaud 2004). Thus, the addition of a small amount of sugar (about 2% to 7%) is added to
dough to increase the effectiveness of yeast during fermentation
(Poitrenaud 2004). The added sugar acts as a temporary leavening
agent, while being used by the yeast, causing the dough to rise at
a quicker and more consistent rate.
As stated earlier, sugars such as dextrose or lactose are also
used as a carrier for other ingredients because of their bulking
properties. The sugars associated with these ingredients are
incidentally added to the finished product with no intention of
them to function as a sweetener. Isomaltulose and tagatose could
be classified as sugars from a structural standpoint, and they are
commonly used as bulking agents, like lactose, but are also used
for their sweetness (Wilson 2007; Sentko and Bernard 2012).
When comparing relative sweetness, both are sweeter than lactose
(Table 1 and Table 6) and, therefore, a more accurate description
of them is “bulk sweeteners” versus “bulking agents.” However,
they were not discussed in the FDA’s proposal as added sugars,
even though tagatose and isomaltulose could be added to a food
product as a free monosaccharide or disaccharide, respectively.
C 2015 Institute of Food Technologists®
Naturally occurring sugars such as
lactose in milk or fructose in fruits
Intrinsic sugars (incorporated within
the structure of intact fruit and
veggies) and sugars from milk
(lactose)
Naturally occurring sugars found in
foods such as fruit (fructose) and
milk (lactose)
Naturally occurring sugars such as
lactose in milk or fructose in fruits
Perhaps FDA did not include these sugar-like compounds because
they differ from a physiological standpoint when compared to a
typical sugar. They do not promote tooth decay and have lower
glycemic values compared to sugar (Sentko and Bernard 2012;
Vastenavond and others 2012). Thus, they are more like sugar
alcohols than typical sugars, so it brings up the question whether
they should be considered “added sugars.”
The various functionalities of added sugars become more evident with the other nutritive sweeteners that FDA classified as
“added sugars” and multicomponent ingredients that can contain both inherent sugar and sugar added during processing. For
some food products, fruit juice concentrates are added to food
for the sole function of providing color, following section FDA
21 C.F.R. § 73.250 (2014a). Juice concentrates are also commonly used to adjust the Brix levels of directly expressed juice,
and these juice concentrates are not required to be reflected in
the common or usual name of such juices under FDA 21 C.F.R.
§ 102.33(2014a). Fruit and fruit puree ingredients that contain
some sugar added during processing are often added to foods
for several purposes, such as providing texture, flavor, nutrients,
sweetness, or adjusting soluble solids (GMA 2014).
One example with fruit purees is applesauce that may be used
as a substitution for oil in baked goods in order to reduce the fat
content (GMA 2014). Applesauce exists in both sweetened and
unsweetened forms. In both, there are inherent sugars from the
apples, but in the sweetened form, there are also sugars added
during processing. Both the inherent sugars and the added sugars
may contribute to the sweetness of the product. In this case, the
main functionality of the applesauce is an oil substitution, but because it may also contribute to sweetness, it brings up the question
whether the sugars, inherent or added, in the applesauce should
also be considered added sugars.
Conversely, sweetened condensed milk is added to dessert
products for sweetness and flavor. Condensed milk is made from
milk that has been heated to remove some of the water, and this
evaporation of the water concentrates the inherent sugar (lactose)
in the product (FDA 21 C.F.R. § 131.120 2014a). A nutritive
carbohydrate sweetener such as sucrose is also added during its
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Challenges of labeling added sugars . . .
Table 3–Summary of various labeled added sugars values based on different interpretations for a fruit-flavored soy-based yogurt alternative product
Ingredient(s) considered
added sugars
Ingredient(s) excluded
from added sugars
calculation
Added sugars
(unrounded)a
Total sugars (unrounded)b
Interpretation 1
Interpretation 2
Interpretation 3
Interpretation 4
Sugar, fruit, soymilk,
natural flavor, juice
concentrate
Sugar, natural flavor, juice
concentrate
Sugar
Sugar (fermentation loss
from added sugars only)
Inherent sugar in soymilk
and fruit
Inherent sugar in fruit and
soymilk, natural flavor,
juice concentrate
21.22 g
22.78 g
22.78 g
22.1 g
Inherent sugar in fruit and
soymilk, natural flavor,
juice concentrate
21.92 g
22.78 g
22.78 g
22.78 g
Interpretation one: The manufacturer interprets that any substance with calories that contributes to the sweetness of a product could be considered a “caloric
sweetener.”
Interpretation two: The manufacturer subtracts the inherent sugars from the soymilk and the blueberries from the added sugars value, but keeps the trace
amount of sugars in the natural flavor and the fruit juice concentrate as added sugars.
Interpretation three: The manufacturer only counts the added sugars from the sweetened soymilk, the fruit blend, and the entire amount of cane sugar
directly added in the formula. In this case, the manufacturer rationalizes that the functionality of the natural flavor and fruit juice concentrate is not for
sweetening. The natural flavor is for flavoring, and the fruit juice concentrate is for coloring.
Interpretation four: The manufacturer is following the same rationale as Interpretation three, but also assumes that the cultures only metabolize the added
sucrose versus the inherent sucrose in the soymilk.
a This is the unrounded figure in order to show the variation.
b This is the total with a 2 g fermentation sugar loss.
manufacture, hence, the name sweetened condensed milk (FDA
21 C.F.R. § 131.120 2014a). Thus, it contains a mixture of both
inherent concentrated lactose sugar and added sucrose sugar. Given
that sweetened condensed milk can substitute for added sugars in
the finished product, it highlights whether the inherent lactose
sugar, which has been concentrated similar to fruit juice concentrates, should also be considered as “added sugars” in addition to
the added sucrose. This is further complicated when the manufacturer adds water in conjunction with the sweetened condensed
milk in any finished product. Then the water would fully or
partially reconstitute the concentrated lactose.
In summary, depending on how a food manufacturer interprets
the definition and the functionality of the “added sugars” in the
product, various added sugars values could be declared on the
label. FDA not only needs to specify the functionality of added
sugars in the definition but may need to specify the physiological
characteristics as well.
Some sweeteners are not 100% sugars
FDA’s proposed definition includes syrups, honey, and molasses
as “added sugars,” but these sweeteners are not 100% sugars. They
are always mixtures of sugars and water, and some of them also
include other nutrients or substances. For instance, molasses naturally contains high levels of vitamins and minerals, such as calcium, potassium, iron, and B vitamins (Varzakas and others 2012).
Figure 2 summarizes the amounts of water, sugars, and other substances in these types of sweeteners. Thus, the “added sugars”
definition should be clarified further that the sugars in syrups,
honey, molasses, and similar products should be considered on a
dry weight basis ensuring that the contribution of the sugars in
these foods is represented accurately (GMA 2014).
Ingredient supplier complications
The lack of an analytical method for added sugars not only causes
challenges for the FDA but for food manufacturers as well. Food
manufacturers would need access to certain records or information from ingredient suppliers in order to determine the finished
product added sugars values. This could be challenging for food
manufacturers that use hundreds, or many more, of ingredients.
Some ingredient suppliers are small and do not have the current
databases or resources to provide this information immediately.
Furthermore, suppliers may not want to overshare information,
due to proprietary reasons, because there is the potential risk of
formula information getting in the hands of competitors. Besides
these issues, ingredient suppliers can also interpret the definition
of added sugars differently. As stated earlier, this becomes evident
with multi-component ingredients and other functional uses of
added sugars in ingredients. For example, a supplier may provide
an ingredient that contains multiple components, such as honey,
fruit juice concentrates, and fruit puree with intrinsic and added
sugars. Depending on how the definition is interpreted, the supplier may consider all of these components as “added sugars” or
may only consider some of them as “added sugars.” These different interpretations along with minor differences in calculations,
compounded by rounding-off numbers, can result in a variety
of declared values for added sugars. Thus, this could be a timeconsuming process for food manufacturers and ingredient suppliers
to agree on an added sugars value for an ingredient.
Complexity of chemical reactions
There are significant difficulties calculating the added sugars
in products subjected to fermentation, carmalization, and Maillard reactions. These reactions metabolize or transform sugars into
other compounds that are no longer detectable as sugars through
conventional analytical methods (Perez-Locas and Yaylayan 2010).
FDA acknowledges these complications from these reactions and
requested more information from manufacturers of such products. The FDA (2014b) does not have adequate data to assess the
degradation themselves.
Yeast-leavened bread shows all 3 reactions during breadmaking,
and the American Bakery Association in its comments to FDA’s
proposal responded that it would be extremely difficult to
calculate the reduction in added sugars in yeast-leavened products
with both naturally occurring and added sugars. As discussed
earlier, additional sugars are added for improved fermentation
because the inherent composition of flour is insufficient in monoor disaccharides. This fermentation process in yeast-leavened
bread is influenced by several “factors including but not limited
to, variations within ingredients (such as yeast activity and flour
quality), ingredients (such as the type and/or amount of sugar,
salt, malt, vinegar, spices, and other components), varying types
of fermentation systems (water brews, flour brews, sponge and
dough, straight dough), and variation in make-up and proof times
and temperatures” (American Baking Association 2014). Besides
650 Comprehensive Reviews in Food Science and Food Safety r Vol. 14, 2015
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Challenges of labeling added sugars . . .
Figure 2–Composition of different sweeteners (USDA Natl. Nutrient Database for Standard Reference 2014).
sugar loss during fermentation, sugars can also disappear during
the baking process through caramelization and Maillard reactions,
which cause the browning of the crust in bread (Purlis 2010).
Other fermented products, such as yogurts, are another example
that may have potential challenges quantifying the amount of
added sugars lost during fermentation. The bacteria cultures
required by the yogurt standard of identity, Lactobacillus, bulgaricus,
and Streptococcus thermophilus, prefer the naturally occurring lactose
in the milk during fermentation. In regular, unsweetened milk, it
naturally contains about 5% lactose sugar, and some of the lactose
is metabolized to 1.2% to 1.4% lactic acid, which results in the
pH drop in yogurt (Tamime and Robinson 1999; Gürakn and
Altay 2010). However, S. thermophilus also has the capability to
metabolize sucrose (Nauth 2004), and in the production of yogurt,
manufacturers can add sucrose (dry or liquid) to the milk blend
C 2015 Institute of Food Technologists®
before it is fermented. Studies with fermented soymilk utilizing
similar cultures as in dairy yogurt have confirmed this, showing
that S. thermophilus is well able to grow in soy beverages because of
its ability to use sucrose, which occurs naturally in soymilk (Garro
and others 1999; Farnworth and others 2007). In addition to the
required cultures, according to the yogurt standard identity, other
optional cultures can be incorporated via the starter culture in the
yogurt, such as Lb. acidophilus or Lb. casei. Both of these cultures
are capable of metabolizing sucrose as well (Nauth 2004). Thus,
depending on the types of cultures and milk used to produce
a yogurt-like product compounded with processing variability,
the amount of added sugars consumed during fermentation will
vary, and more studies are needed in these types of products in
order to understand the complexities of added sugars loss during
fermentation.
Vol. 14, 2015 r Comprehensive Reviews in Food Science and Food Safety 651
Challenges of labeling added sugars . . .
Without an analytical test to distinguish added sugars from those
naturally occurring in food, manufacturers will not be able to discern where the sugar loss is occurring as result of these reactions.
These chemical reactions depend on several variables, which are
unique to each formula and process, and it would be impossible to come up with a standard equation that could be applied
across each similar food product. Therefore, it would be a timeconsuming process to research each unique product formula, and
manufacturers may resign themselves to declaring all added sugars
without a reduction from these reactions, thereby resulting in an
overstatement of the amount of added sugars in these products.
Fruit-flavored soy-based yogurt alternative case study
The following is a case study summarizing the complexities
and challenges of labeling added sugars in a fruit-flavored soybased yogurt alternative. A typical ingredient deck for this type
of food product is below, and the ingredients underlined could
be or could not be considered “added sugars” depending on the
various interpretations of FDA’s proposed definition. This example
also highlights the impact of fermentation. Table 3 summarizes the
interpretations and how different added sugars labeled values could
be derived for the same product.
Ingredients: cultured pasteurized soymilk, cane sugar, blueberries,
pectin, calcium carbonate, elderberry juice concentrate (for color),
natural flavor.
In this particular case, the manufacturer is receiving a sweetened plain soymilk with sucrose. According to the USDA database
(2014), an unsweetened plain soymilk naturally contains 1 g of sucrose per cup (243 g). The serving size of the soy yogurt is 6 oz
(170.1 g). The formula assumptions of the finished product are
listed in Table 4, and the amount of sugar from each ingredient
was determined by using the USDA database (2014). The amount
of sugar lost as a result of fermentation was estimated to be 2 g
(Farnworth and others 2007).
Issues with Replacing Added Sugars
Sugar (sucrose) has several functional properties in food, which
makes it challenging to replace. No other sweetener has been developed to duplicate all of its functional properties. Thus, it is
imperative to understand how the sugar is functioning in a particular food product before replacing it. Other nutritive sweeteners,
such as honey, high-fructose corn syrup, or fruit juice concentrates, have been used in the past. However, because nutritive
sweeteners are considered added sugars, more manufacturers will
be looking at using nonnutritive sweeteners to replace sugar in
their products.
Synergistic relationship of nonnutritive sweeteners
and bulking agents
Nonnutritive sweeteners are also called high-intensity sweeteners because of their very intense sweetness compared to sucrose. Sucrose is given an arbitrary sweetness level of 1 to allow its
comparison with other sweeteners (Table 5). Given their intense
sweetness, nonnutritive sweeteners are used in small amounts in
food products, and as stated earlier, many are not completely metabolized by the body. Both of which explain why nonnutritive
sweeteners do not provide calories like sugar. Because of their low
usage levels, something else needs to replace the reminder of the
missing sugar amount in the product, and this is where bulking
agents or bulk sweeteners come into play.
This is similar technology that is utilized to replace fat in products. Fat, like sugar, provides bulk, mouthfeel, and texture to food
products. Without the use of bulking agents, food products would
not be appealing to the consumer. For example, if sugar is removed
from bran cereal, it would have the consistency of sawdust (Varzakas and others 2012).Bulking agents can provide some sweetness
but their primary function is providing bulk (Wilson 2007).
Table 6 lists some common bulking agents, and their relative
sweetness is below that of sucrose with some even at 0. It is
important to find bulking agents that can work synergistically
with nonnutritive sweeteners.
Other functional considerations
Besides the lack of bulk, there are other functional issues that
will need to be addressed when replacing sugar in food products. One of the key issues is taste. Nonnutritive sweeteners may
have a bitter, metallic, and licorice aftertaste (Varzakas and others
2012). Blends of various nonnutritive sweeteners can be used to
mask these off-flavors and improve the sweetness profile of food
products. These blends make use of sweetener synergy where the
sweetness intensity of the blend is greater than the total sweetness
of the individual components (Wilson 2007). The use of flavor
technology is another area that can be utilized to help address
these undesirable aftertastes as the result of using nonnutritive
sweeteners.
As mentioned earlier, ingredients that are used as fat-replacers
can also be utilized in replacing sugar in food products. This is why
some of the bulking agents listed in Table 6, such as maltodextrins
and polydextrose, can also be used as fat-replacers. Other
ingredients, which may be used when replacing sugar or fat in a
product, include starches, modified starches, cellulose, guar gum,
gelatin, and carrageenan. They are used to modify the physical
properties of food, such as acting as a thickener, to help replace
the structural characteristics that were originally contributed by
sugar or fat. Thus, they are utilized for the same reasons as bulking
agents to help improve the mouthfeel of the product. However,
these ingredients must be chosen carefully because they can
affect the flavor and viscosity of the product. Some have shown to
reduce the perceived sweetness of a product (Spillane 2006). Thus,
the sweetener blend may need to be modified, such as increasing
the level. Others, such as cellulose, have caused the products
to become too viscous with a gummy mouthfeel (Varzakas and
others 2012).
Another consideration is whether the sugar is participating in
any chemical reactions, such as the Maillard reaction in baked
goods. In this case, the brown color as the result of this reaction
is important to the finished product. Some of the nonnutritive
sweeteners may be capable of participating in the Maillard reaction but cannot produce the brown color due to their low usage
levels (Kitts 2010). Furthermore, all sweetness is lost if they do
participate in the reaction (Varzakas and others 2012). Therefore,
it is important to select the right nonnutritive sweetener and a
bulking agent that could participate in the reaction versus the
sweetener. Finally, there is no known nonnutritive sweetener that
can participate in caramelization (Varzakas and others 2012).
Replacing sugar in a product is a trial and error process given all
the functional properties that sugar can contribute. Each product
formula is unique and one size does not fit all. For example, a study
was done to evaluate the effects of fat and sugar replacements in
cookies, and one of the combination ingredients was polydextrose
as the fat mimetic and maltitol as the sugar substitute (Zoulias and
others 2002). The use of these ingredients resulted in very hard and
brittle cookies, and the study concluded that the textural properties
were improved by either decreasing the amount of alternative
652 Comprehensive Reviews in Food Science and Food Safety r Vol. 14, 2015
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Challenges of labeling added sugars . . .
Table 4–Formula assumptions for fruit-flavored soy-based yogurt alternative case study.
Grams per serving size (170.1 g)
Ingredient
% of Finished product
Inherent
Added
Total
80
10
8
1
0.5
0.3
0.2
100
0.7
3.5
17
2.72
4.2
17
3.398
0
0
0.1
0.08
24.778a
Sweetened plain soymilk
Cane sugar
Blueberry fruit blend (50% fruit and 20% sugar)
Pectin
Calcium carbonate
Elderberry juice concentrate
Natural flavor
Total
0.678
a This is the total before the 2 g are subtracted for fermentation.
Table 5–Nonnutritive sweeteners comparison to sucrose at relative sweetness 1.
Nonnutritive sweetener
Aspartame
Acesulfame K
Sucralose
Saccharin
Steviol Glycosides
Glycyrrhizin
Neohesperidin dihydrochalcone
Neotame
Thaumatin
Cyclamatea
Relative sweetness
kcal/g
Source
Aftertaste
Reference
160–220
150–200
400–800
300—600
200-300
50–100
1000–2000
7000–13000
2000
30–40
4
0
0
0
0
0
2
0
4
0
Synthetic
Synthetic
Synthetic
Synthetic
Plant
Plant
Semis-synthetic
Synthetic
Plant
Synthetic
Prolonged sweetness
Very slightly bitter
Not unpleasant
Bitter, metallic
Bitter, unpleasant
Prolonged sweetness, licorice
Lingering menthol-licorice
Not unpleasant
Licorice
Prolonged sweetness
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
a Banned in the United States due to controversial toxicity studies but permitted in other countries (EU, Australia, Canada, New Zealand).
Table 6–Bulking agents comparison to sucrose at relative sweetness 1.
Bulking agent
Xylitol
Maltitol
Erythritol
Sorbitol
Mannitol
Isomalt
Lactitol
Hydrogenated starch hydrolysates
Polydextrose
Isomaltulose
Tagatose
Maltodextrin (depends on DE value)
Fructooligosaccharides
Inulin
Relative sweetness
kcal/g
1
0.75
0.7
0.60
0.60
0.55
0.35
0.4–0.9
0
0.48
0.92
0.1–0.2
0.3–0.6
0
2.5
2.7
0.2
2.5
1.5
2.1
2
2.4–3.0
1
4
1.5
1–3.8
2
1
sweetener or increasing the concentration of fat mimetic in the
gel which was added to the cookies. Thus, it can be a costly and
lengthy process to find the right ingredients, the correct amounts,
and manufacturing parameters to create similar-quality products
without sugar. In the end, it is not possible to match exactly the
same quality characteristics of the nutritive sweetener-containing
counterparts, and the consumers will ultimately decide what they
find acceptable.
Calorie reduction may not be achieved
The driving force of replacing added sugars in a product is to
reduce the calories. However, in some cases, calorie reduction may
be insignificant or may even increase. When sugar is removed, it
generally must be replaced with something else, so that the bulk
of the product is not affected. As stated earlier, this is why bulking
agents are utilized. However, these bulking agents usually provide
energy because they are carbohydrate-based (Table 6).
Isomaltulose is a prime example. As discussed earlier, it is a
disaccharide-type carbohydrate that could be classified as a sugar,
C 2015 Institute of Food Technologists®
Reference
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Varzakas and others 2012
Deis 2012; Varzakas and others 2012
Varzakas and others 2012
Sentko and others 2012; Varzakas and others 2012
Vastenavond and others 2012
Varzakas and others 2012
Gwinn 2013
Gwinn 2013
but it is not a typical sugar from a physiological point of view
(Wilson 2007). Isomaltulose is completely absorbed by the small
intestine, thus providing the same calorie value as sucrose at
4 kcal/g (Wilson 2007). Other bulking agents, such as maltodextrins or hydrogenated starch hydrolysates, can still contribute above
3 kcal/g, so that calorie reduction may be insignificant in the final
product (Deis 2012; Varzakas and others 2012). Depending on
the functionality needs in the product, using lower or noncaloric
bulking agents may not be an option.
In one particular instance, a sugar-free baking batter was formulated using an increased level of flour and water, a hydro
genated starch hydrolysate (Hystar 5875), and the nonnutritive
sweetener aspartame (Wallin 1996). The hydrogenated starch hy
drolysate Hystar 5875 that was used had about 4 kcal/g of solids,
and the flour of the product was increased, which contributes
4 kcal/g as well. Thus, the total calorie content of the product was
not significantly reduced, but it was essentially free of added sugars.
Besides adjusting a carbohydrate-based ingredient, such as flour
or starch, fat is another option to replace bulk and mouthfeel of
R
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Challenges of labeling added sugars . . .
the product. Fat contributes 9 kcal/g. Thus, the calorie reduction
of the total product may be negated or even increased depending
on how much of the fat is used in the product. One study
developed a cookie dough with acesulfame-K instead of sugar and
polydextrose as a bulking agent (Bullock and others 1992). Nutrient analysis revealed that calorie reduction in the formulation
was rather insignificant(less than 10%), because the fat proportion
increased in the end product. This sugar-fat seesaw effect has also
been shown through a systematic review of dietary intake studies
for countries with cultural similarities: United Kingdom, Ireland,
other European countries, United States, and Australia (Sadler
and others 2014). This review demonstrated there is a strong and
consistent inverse association between total sugars and total fat
intakes expressed as percentage energy. Thus, multiple guidelines
in regards to fat and sugar may be difficult to achieve in practice
at the population level and may not result in the calorie reduction
as intended.
Other concerns with added sugars replacements
Another main hurdle that manufacturers will face with replacing
added sugars in products is the consumer movement for “cleaner”
labels and “natural” ingredients. As discussed earlier, several
ingredients may need to be added, such as multiple high-potency
sweeteners, fat, bulking agents, thickeners, and flavoring, in order
to replace one ingredient (sugar). Thus, the numbers and amount
of food additives on the food label will increase, which will be
viewed negatively by some consumers. Some of these ingredients
are produced synthetically or via chemical modification. Thus,
they would not be considered “natural.” In some cases, consumers
may prefer naturally occurring nutritive sweeteners such as honey.
Even though honey consists mainly of sugars, it also provides
vitamins, minerals, and antioxidants (Varzakas and others 2012),
which may be regarded more positively compared to other
sweeteners by some consumers. These consumers like that they
understand what the ingredient is and where it is coming from.
There may also be general public health concerns in regards to
the food technology used to replace added sugars. Commonly used
nonnutritive sweeteners to replace sugars are artificial sweeteners,
such as aspartame, acesulfame K, sucralose, and saccharin. There is
a public perception that artificial sweeteners are unsafe to consume.
This is mainly driven by animal studies conducted in the 1970s
that linked saccharin to cancer (Intl. Food Information Council
[IFIC] 2003). However, those studies used extremely high doses
compared to what is normally consumed in the human diet, and
several epidemiological studies since then have been carried out
showing no link between cancer and saccharin consumption (IFIC
2003). Yet, the public perception that artificial sweeteners can
cause cancer still remains today.
Another health concern with the artificial sweetener aspartame
is that it contains phenylalanine. Certain individuals (with a genetic
disorder) lack the enzyme phenylalanine hydroxylase (PAH) to
metabolize phenylalanine. This accumulation of phenylalanine,
which is further converted to phenylpyruvate, can cause serious
damage in brain development (Varzakas and others 2012). As a
result of this health risk, products that contain aspartame must
have a warning label stating that it contains phenylalanine (FDA
21 C.F.R. § 172.804 2014a). Besides products with aspartame
carrying a warning label, some products containing sugar alcohols
also need one stating that excessive consumption can have a laxative
effect (FDA 21 C.F.R. §§ 180.25, 184.1835 2014a).
Like fat, salt may also be increased in foods with reduced or
replaced sugar contents. It has been known for some time that
the additions of salt and sugar work synergistically to increase
the intensity of sweetness (Kilcast and Ridder 2008). Thus, it is a
potential tool for manufacturers to increase salt in order to increase
the sweetness of the product to compensate for the reduction of
sugar. Nonetheless, salt is a nutrient of concern given its link
to cardiovascular diseases (Dötsch and others 2009). In a sense,
replacing sugar or reducing sodium in a product can become a
“lesser of 2 evils game.”
The effectiveness of nonnutritive sweeteners
The theory behind replacing added sugars is to reduce calories which, consequently, could lead to weight loss. Nonnutritive
sweeteners can help achieve the similar sweetness characteristics as
sweetened foods without adding calories. However, in the recent
release of the Scientific Report of the 2015 Dietary Guidelines,
the advisory committee cited that there is insufficient evidence
to recommend the use of nonnutritive sweeteners as an effective
strategy for long-term weight loss and weight maintenance and
that added sugars should not be replaced with nonnutritive sweeteners in foods and beverages (USDA and HHS 2015). This could
be related to the fact that calorie reduction in the total product
is ultimately not reduced or that consumers use it as an excuse
to ingest calories in other forms. Yet, nonnutritive sweeteners in
conjunction with bulking agents are the most effective strategies
to replace added sugars in the food industry as of now. It is very
unlikely that there will be many new sugar replacers developed
over the next decade. The time and cost of development alone
and the regulatory hurdles for new food ingredients will inhibit
their speed to market (Spillane 2006).
The Effectiveness of Labeling Added Sugars
Obesity is growing at an alarming rate in the United States, and
added sugars are being targeted by governmental regulatory agencies in an attempt to reduce the calorie intake of the population.
FDA’s theory is that labeling added sugars will assist consumers to
identify foods that are nutrient-dense and to reduce calorie intake
from added sugars by decreasing their consumption (FDA 2014b).
Yet, it is not clear that the labeling of added sugars will benefit
consumers.
Consumer confusion with proposed label
The IFIC conducted a national survey of adult U.S. consumers
to investigate consumer understanding of the “added sugars” declaration on the proposed label. Consumers were shown 3 Nutrition Facts panels for the same food product. Version S was in the
proposed format panel with the “Sugars” designation as shown
in the current Nutrition Facts panel. Another version, Version
S+A, was the exact format in FDA’s proposal with the “Sugars”
designation and “Added Sugars” as a subgroup designation. The
third version, Version TS+S, matched Version S+A except that
the “Sugars” designation included the word “Total” in front of it.
When asked to report the total amount of sugars in the product,
92% answered correctly with version S, but only 55% answered
correctly with version S+A (IFIC 2014).
IFIC (2014) research also demonstrated that consumer understanding of the “Added Sugars” line varies with 19% of consumers
stating that they did not know what it means. This was further exemplified when consumers were given a list of 23 types of nutritive
and nonnutritive sweeteners and asked to indicate which would be
included in the “Added Sugars” line on the Nutrition Facts panel.
Over one-third of respondents indicated that nonnutritive sweeteners would be considered added sugars: Sweet ‘n Low (39%),
654 Comprehensive Reviews in Food Science and Food Safety r Vol. 14, 2015
C 2015 Institute of Food Technologists®
Challenges of labeling added sugars . . .
not completely solve the obesity issue. Even though the research
is mixed, the overall consensus is that balancing total energy intake
with calorie expenditure is the best approach to prevent weight
gain (Marriott and others 2010; Jebb 2014). Foods containing
added sugars do not contribute to weight gain any more than
another calorie source (Van Baak and Astrup 2009; Gibson and
Food sources of added sugars
In the Scientific Report of the 2015 Dietary Guidelines, food others 2013). Finally, sugar consumption is already decreasing in
sources of added sugars were broken down by categories. Bev- the United States without added sugars being on the Nutrition
erages, excluding milk and 100% fruit juice, accounted for 47% Facts label (USDA and HHS 2015; Wittekind and Walton 2014).
of added sugars consumption (USDA and HHS 2015). In these
types of beverage products, the current total sugars declaration Cost of implementation
Labeling added sugars will result in additional costs for ingredireflects the amount of added sugars because virtually all the sugar
is added. The food categories dairy and grains, for which label- ent and food manufacturers. A partnership between manufacturers
ing added sugars will be more of a challenge, only accounted for and suppliers will be needed to ensure that the added sugars def4% and 8% of added sugars consumption, respectively (USDA and inition is interpreted consistently, so that the sources of added
HHS 2015). These categories included the yeast-leavened and fer- sugars are identified and reported correctly. In addition, a plan for
mented products, which transform added sugars into other com- record-keeping requirements and database updates will need to be
pounds via chemical reactions. Again, these chemical reactions implemented by the food industry because there is no analytical
depend on several variables which are unique to each formula method to distinguish between naturally occurring and added sugand process, and it will be a time-consuming process to research ars in food products. This record-keeping will be more taxing for
each unique product formula to understand the amount of added food products that add sugar for other reasons besides sweetening
sugars lost. These categories also provide other nutrients besides and contain both inherent and added sugars, and further research
added sugars, such as vitamin D, calcium, dietary fiber, B vitamins, will be needed to understand the added sugars loss as a result of
whole grain, and iron. The category snacks and sweets provided chemical reactions in certain types of food products. Ultimately,
31% of added sugars consumption (USDA and HHS 2015). These this additional cost will be passed on to the consumer.
included desserts, such as cakes, cookies, and chocolate, and these
types of products may also have a challenge in labeling the exact Conclusion
Labeling “added sugars” will have its challenges in the food
amount of added sugars due to the Maillard and caramelization
reactions. However, one could reason that consumers understand industry, and it is not clear that it will benefit the consumer either.
and consume these types of products as indulgent treats in their The scientific evidence linking added sugars intake to obesity and
diet. Thus, consumers are enjoying these types of products for other diseases is neither complete nor perfect. Overall, the public
health recommendations about “added sugars” must be balanced
pleasure and not for their nutritional value.
with the reality that sugar added to food is an important piece in
the food science puzzle given its several functionalities in food.
Added sugars and link with public health concerns
FDA did not provide a daily recommended value (DRV) for Not only can a spoonful of sugar help the medicine go down, but
added sugars consumption. The reason for excluding a DRV is it can help fruits, vegetables and fiber go down as well.
Splenda (38%), Aspartame (35%), and Stevia (34%) (IFIC 2014).
In summary, this study showed that the most useful terminology
for consumers is “total sugars,” and consumer education will be
key to ensure proper understanding of added sugars.
that there is no sound scientific evidence for the establishment
of a quantitative intake recommendation for which a DRV for
added sugars can be derived (FDA 2014b). Policy decisions must
be based on scientific evidence, and in the case of added sugars,
the scientific evidence that decreasing added sugars intake will
decrease the risk of obesity and other diseases is neither complete
nor perfect.
Yet, the Scientific Report of the 2015 Dietary Guidelines
Advisory Committee urges FDA that added sugars should be
labeled and a DRV should be established. Their recommendation
is limiting added sugars to a maximum of 10% of total daily
caloric intake based on strong evidence that limiting added sugars
intake will reduce health risks, such as excessive body weight
and type II diabetes (USDA and HHS 2015). However, when
reviewing the sources cited in the report, most of the systemic
reviews and meta-analyses focused on sugar-sweetened beverages.
As discussed earlier, the total amount of sugars would be the same
as the amount of added sugars in these types of products. More
studies are needed with food, especially food with both naturally
occurring sugars and added sugars, to determine if “added sugars”
is directly linked to negative health outcomes or whether it is an
outcome of excessive calorie consumption.
The etiology of obesity is complex, and confounding factors,
such as total energy intake, BMI, sex, age, physical activity, ethnicity, and family culture can contribute to weight gain. Thus,
focusing on a single nutrient, as in this case of added sugars, will
C 2015 Institute of Food Technologists®
Acknowledgment
Kara R. Goldfein held employment at General Mills while writing this article.
Authors’ Contributions
Kara R. Goldfein wrote the article under the supervision of
Joanne L. Slavin.
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